From patchwork Thu Mar 21 16:36:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Julien Grall X-Patchwork-Id: 10864015 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E679C13B5 for ; Thu, 21 Mar 2019 16:37:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C4A2F28BAA for ; Thu, 21 Mar 2019 16:37:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B904B2A392; Thu, 21 Mar 2019 16:37:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 5F7F428BAA for ; Thu, 21 Mar 2019 16:37:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=bZLJC+LMoFU/zSGiYoxfTp1pUN44q3D05q38ch6ht1k=; b=ItsoAQLM7esy1zQ/ecrF4WYNn+ pyqvlOXYygC50DogrxgLhRCC1+8EQCMjxOA/1R187OWlE8q5ebVVCPD9iY1q4V0hIyL5Yr19P+Gy7 PWv2gLZXl4ft3PcDAwhjDUBR0PTg5c2Wz4CVyhrotFr8V8YBo7+RNfG3jJoDaS1Zo2DAOnQm3t0jT Ko67OpBs0+c+r+ugCQplZIoIN3q4n9mbn3VjxPAFpMs5sIr+CCljBOcXq280SyRaneTbprWF6wm+D J/g24O7yAlK9/QZJTIuUPQD8rRUq82XW8EsAJ1pXNluBFOnnKyNtyRshHbOdeyjVM6jpHMK+2JNkJ H2qwi7Nw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h70hS-0000gF-Gc; Thu, 21 Mar 2019 16:37:50 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h70gW-0007qF-HQ for linux-arm-kernel@lists.infradead.org; Thu, 21 Mar 2019 16:36:56 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C1893165C; Thu, 21 Mar 2019 09:36:51 -0700 (PDT) Received: from e108454-lin.cambridge.arm.com (e108454-lin.cambridge.arm.com [10.1.196.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D1BD23F614; Thu, 21 Mar 2019 09:36:49 -0700 (PDT) From: Julien Grall To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Subject: [PATCH RFC 05/14] arm64/mm: Remove dependency on MM in new_context Date: Thu, 21 Mar 2019 16:36:14 +0000 Message-Id: <20190321163623.20219-6-julien.grall@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20190321163623.20219-1-julien.grall@arm.com> References: <20190321163623.20219-1-julien.grall@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190321_093652_919580_5532B0D8 X-CRM114-Status: GOOD ( 12.96 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: suzuki.poulose@arm.com, marc.zyngier@arm.com, catalin.marinas@arm.com, julien.thierry@arm.com, will.deacon@arm.com, christoffer.dall@arm.com, Julien Grall , james.morse@arm.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The function new_context will be part of a generic ASID allocator. At the moment, the MM structure is only used to fetch the ASID. To remove the dependency on MM, it is possible to just pass a pointer to the current ASID. Signed-off-by: Julien Grall --- arch/arm64/mm/context.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c index e98ab348b9cb..488845c39c39 100644 --- a/arch/arm64/mm/context.c +++ b/arch/arm64/mm/context.c @@ -151,10 +151,10 @@ static bool check_update_reserved_asid(struct asid_info *info, u64 asid, return hit; } -static u64 new_context(struct asid_info *info, struct mm_struct *mm) +static u64 new_context(struct asid_info *info, atomic64_t *pasid) { static u32 cur_idx = 1; - u64 asid = atomic64_read(&mm->context.id); + u64 asid = atomic64_read(pasid); u64 generation = atomic64_read(&info->generation); if (asid != 0) { @@ -236,7 +236,7 @@ void check_and_switch_context(struct mm_struct *mm, unsigned int cpu) /* Check that our ASID belongs to the current generation. */ asid = atomic64_read(&mm->context.id); if ((asid ^ atomic64_read(&info->generation)) >> info->bits) { - asid = new_context(info, mm); + asid = new_context(info, &mm->context.id); atomic64_set(&mm->context.id, asid); }